Cake\Database\Schema\PostgresSchema::convertIndexDescription PHP Метод

    public function convertIndexDescription(Table $table, $row)
    {
        $type = Table::INDEX_INDEX;
        $name = $row['relname'];
        if ($row['indisprimary']) {
            $name = $type = Table::CONSTRAINT_PRIMARY;
        }
        if ($row['indisunique'] && $type === Table::INDEX_INDEX) {
            $type = Table::CONSTRAINT_UNIQUE;
        }
        if ($type === Table::CONSTRAINT_PRIMARY || $type === Table::CONSTRAINT_UNIQUE) {
            $this->_convertConstraint($table, $name, $type, $row);
            return;
        }
        $index = $table->index($name);
        if (!$index) {
            $index = ['type' => $type, 'columns' => []];
        }
        $index['columns'][] = $row['attname'];
        $table->addIndex($name, $index);
    }